Sash lock



SASH LOCK Fred Granberg, Chicago, Ill. Application .lune 21, 1956, Serial No. 592,860

3 Claims. (Cl. 292-336) This invention relates to a sash lock and in particlular to trip means for use with an automatically operable window sash lock.

While several forms of automatically operated sash locks are known in the art, disadvantages lare found therein such as the means for tripping the movable latch mechanism being relatively complex and occasionally catching thereby failing to function properly. Another disadvantage in certain of such tripping devices is that they are arranged to be mounted on top of the sash lock mechanisms, thereby interfering somewhat with the manual operation of the lock.

The principal feature of this invention is the provision of a new and improved trip` for use with automatically operative sash locks.

Another feature is the provision of a new and irnproved sash lock trip adapted to be mounted general-ly below the rotatable latch mechanism.

A further feature of the invention is the provision of a new and improved latch mechanism comprising a pivotable pin arranged for operable association with a generally outwardly extending edge of the rotatable latch plate. f A still other feature of' the invention is that the latch plate edge is provided with a rearwardly curved portion adapted to limit engagement of the edge to the arcuate perimeter of the pin.

A still further feature of the invention is that the pin is provided with a longitudinal mid-portion slidably and pivotally mounted on the latch, from one end of which pin radially extends a first end disposed adjacent the sash lock catch, and from the other end of which extends substantially perpendicular to the plane of the first end and the mid-portion a second end disposed adjacent the latch plate, with spring means for positioning the second end in the path of rotation of the latch plate and with engagement of the first end with the catch acting to remove the second end from the path of rotation of the latch plate by pivoting the pin about the axis of the mid-portion.

Other features and advantages of the invention will be apparent from the following description taken in connection with the accompanying drawings, wherein:

Figure 1 is a top plan View of a sash lock having a trip embodying the invention and with the latch plate in the unlocked position;

'Figure 2 is a top plan view similar to Figure 1 butwith the latch plate in the locked position;

Figure 3 is a sectional View taken approximately along the line 3-3 of Figure l;

Figure 4 is a sectional view taken approximately along the line 4 4 of Figure 2;

Figure 5 is a bottom plan view of the latch; and

Figure 6 is a sectional view taken approximately along the lline 6 6 of Figure l, but with one portion or" the window having the latch mounted thereon being displaced upwardly from the other portion of the window having the catch mounted thereon.

In the exemplary embodiment of the invention as disclosed in the drawings, a sash lock generally designated 10 is seen to comprise a catch 11 mounted on a window member 20, and a latch 12 mounted on a window mem- -ber 21 which is movable relative to window member 20. Typically, members 20 Iand 21 may be `the check rails of the Icommon double-hung type window. Latch 12 is provided with a rotatable latch plate 13 which is arranged to have inte-flocked engagement with catch 11 for preventing movement between window members 20 and 21 when desired. To efr'ect automatically such interlocking vwhen latch 11 and latch 12 `are juxtaposed, latch plate biasing means 14 are provided, illustratively shown as a helical spring 14. To control the automatic operation of latch plate 13 a trip, generally designated 15, is provided.

Catch 11 comprises :a generally flat base 11a lixedly secured to the window member 20 by suitable means such as screws 11b, and having an upstanding mid-por tion 11C provided with an overhanging lip 11d adapted to have removable locking engagement with the latch plate 13. Base 11a is provided with a recess lle ad-.

jacent one end 11f for receiving a portion of trip 1S as will be described more fully hereinafter.

Latch 12 includes a generally flat base 12a havin-g a peripheral depending rim 12b adapted to space base 12o upwardly `of window member 21 thereby forming a cavity 12C in which spring means 14 and portions of trip 15 are received. Suitable means such as screws 12d are provided for securing the latch l2 to the window member 21.

Latch plate 13 comprises a generallytilat, semi-circular carrier 13a having an upstanding, generally semi-cylin drical ange 13b `terminating in a manual operating handle 13C. A leading edge 13]L is provided on carrier 13a,rextending generally outwardly and opposite handle 13C. An inner end 13g of edge 13j is curved rearwardly (in a direction opposite to the direction of motion of edge 13]" when latch plate 13 is being moved from the unlocked position of Fig. l to the locked position of Fig. 2), Extending centrally through carrier 13a, through latch 4base 12a and into cavity 12e is a pivot post 13d rotatably securing the latch plate 13 to the latch base 12a. Fixedly secured to post 13d within cavity 12e is a cup-shaped support 13e. Spring 14 is arranged in concentric surrounding relation to support 14a and has one end iixedly secured to the support and another end 141': held'against movement such as by abutment with latch rim 12b. The action of spring 14- on support 13e is such as to urge the latch plate 13 into a locked position (as shown in Fig. 2). A stop 12e comprising a raised portion in the latch base 12a is provided lto limit the clockwise movement (as seen in Fig. l) of the latch plate 13.

Trip 15 comprises a pin 15a having a longitudinal midportion 15b, ra lirst, radially extending end 15C and a second, radially extending, cylindrical end 15d, arranged to extend substantially perpendicularly to the plane of the mid-portion 15b and lirst end 15C. Latch Abase 12a is provided with an opening 12]c through which trip second end 15d may extend into abutment with leading edge 131C of latch plate 13. Depending from base 12a adjacent `opening 12j is an ear 12g. An opening 12b is provided in rim 12b in alignment with an opening 12g in ear 12g, through which `openings trip pin mid-portion 15b isslidably and pivotably carried.

Latch base 12a is positioned on window member`21 so as to be spaced laterally from catch base 11a, with first Vend 15C being receivable in the're'sultant space 16 when the window members 20 and 21 are juxtaposed. To pivot pin 15a, and position end 15C in space 16, trip 15 further comprises a spring 15e which is secured to mid-portion 15b at the second end 15d, with the free end 15e of the Patented Aug. 5, 1958L spring being secured to the latch base 12a. The tensional torce of spring 15e urges pin 15a inwardly (into cavity 12e) with the abutment of lirst end 15C against latch rim 12b limiting such movement. The counter-clockwise rotation (as seen inFig. 3) of pin 15ncaused by spring 15e is limited by the abutment of first end 15C with the window memberL 21 and, when end 15c'is in abutment with window member 2l, as seen in Fig. 3, second end 15d extends outwardly through latch opening 12f and into the path of rotation of latch plate 13. With latch plate 13 in the unlockedposition of Fig. l, edge 13f en'- gages pin end 15d. By action of spring 14, latch plate 13 urges pin 15a outwardly against the action of spring 15e causing iirst end 15C to abut catch base 11a, such abutment acting to retain pin 15d and prevent rotation of latch plate 13.

As best seen in Fig. 6, when window member 21 is moved away from member 20, spring 14 causes latch plate 13 to move pin 15a further outwardly until second end 15d abuts ear 12g, with first end 15C now being disposed over recess 11e and catch base end 11f. Second end 15d is maintained in the upright position preventing further rotation of latch plate 13, and allowing sash lock to remain in the cocked open condition with the window members 20 and 21 being movable over their normal range of movement.

When, however, the window members are moved to their juxtaposed position, trip trips to allow the rotation of latch plate 13 into the interlocked position of Fig. 2. In electing this tripping action, pin 15a, by the abutment of lirst end 15C against catch base end 11i, is pivoted about'the axis of mid-portion 15b, the outer end of which moves into recess 11e, rotating the pin in a clockwise direction as'seen in Fig. 4. Pin second end 15d is concurrently pivotally removed from engagement with latch edge 133c to a position where it extends below latch carrier 13a. This allows spring 14 to rotate latch plate 13 to a position wherein liange 13C is in interlocked relation with catch lip 11d.

While pin second end 15d has a pivoting movement relative to edge 13], the edge slides primarily against the cylindrical wall surface 15d rather than against the outer tip 15d" of the pin end. This is due to the rearward curving of the inner edge portion 13g, which, as best seen in Fig. l, allows the tip 15d of pin end 15d to clear the latch plate as the pin end pivots to the position of Fig. 2. Such engagement effectively precludes catching of the pin end. Another desirable result of the disclosed structure of tip 15 is that curved inner edge portion 13g, when end 15d is in engagement therewith, acts to pivot the pin in the samedirection (clockwise as seen in Fig. 4) as does catch base end 11)c acting against pin first end 15e, as edge 13g has sliding contact with the trailing portion of the pin surface 15d. This action `further increases the ease of disengagement of pin end 15d from catch plate edge 13)c and assures release or tripping of the latch plate mechanism.

When latch plate 13 is rotated as by manually moving handle 13e to the unlocked position of Fig. l, spring 15e pivots pin 15a to the position where second end 15d is again extended upwardly through opening 121 and irst end 15C is disposed in the space 16. Thus, whenever the window members and 21 are juxtaposed, the sash lock 10 automatically assumes the locked` position. To unlock sash lock 10, the latch plate 13 is merely rotated to the open position and cocked by action of trip 15, and the window members may then be relatively moved to any open position desired without affecting the cocked condition. As the trip 15 is mounted primarily below the catch 12, accessibility to latch plate 13 is substantially unimpeded and by virtue of the novel construction of the trip 15 and latch plate edge 13), a foolproof tripping action is obtained.

While I have shown and described certain embodiments of, my invention, it is to be understood that it is capable of many modifications. Changes therefore in the construction and arrangement may be made without departing lfrom the spirit and scope of the invention as defined in the appended claims.

I claim:

l. A sash lock of the character described, comprising: a catch adapted to be mounted on a sash member; a latch adapted to be mounted on `an adjacent sash member and having a spring biased rotatable latch plate having an outer portion arranged to interlock with said catch when the sash members are closed, said latch plate having an Y edge portion extending inwardly from said outer portion rearwardly to the spring' biased direction of rotation of the latch plate; and trip means for releasably maintaining the latch plate in a cocked position, including a pin slidably and pivotally mounted on said latch and having a longitudinal mid-portion, a radially extending rst end disposed adjacent said catch, and a second, cylindrical end extending substantially perpendicularly to the plane of the lirst end and' said mid-portion, disposed adjacent said edge portion of the latch plate, and spring means for yieldingly positioning'said first end away from said catch. and yieldingly pivoting said pin about the axis of said mid-portion to urge said second end into the path of rotation of said latch plate, said latch plate being adapted to oppose said spring and position said first end to permit Y engagement with said catch whereby said catch causes the pin to pivot about the axis of said mid-portion and the side wall of said second end is engaged by said edge portion to have a component of the biasing force of said latch plate act on said side wall in the direction of: movement of said second end to a position below the path of said latch plate.

2. 1n a sash lock, having a catch, locking means of the character described: a spring biased, generally flat rotatable latch plate with a leading edge having an outer portion extending generally radially from the center of rotation of the latch plate and an inner portion curved rearwardly to the spring biased direction of rotation of the latch plate, and a trip pin having an elongated end adapted to abut said edge, said pin being arranged to pivot the axis of said end in a plane substantially perpendicular to said plate fand generally parallel to said edge, the side wall of said pin end falling away, from the portion thereof abutting the edge outer portion when the pin is perpendicular to said outer portion, whereby a component of the biasing force of said latch plate acts on said side wall in the direction of pivoting of said pin end when said pin end is pivoted to have said side wall engage said inner portion of the latch plate edge.

3. In a sash lock having a catch, locking means of the character described, comprising: a spring biased, generally liat rotatable latch plate with a leading edge having an outwardly extending outer portion and an inner portion curved rearwardly to the spring biased direction of rotation of the latch plate, and a trip pin n having a cylindrical end adapted to :abut said edge, said end being pivotable to move in a plane substantially perpendicular to said plate and generally parallel to said edge, whereby said edge outer portion urges said end generally perpendicularly to said plane when the end is perpendicular to the latch plate, and said edge inner portion urges said end in the direction of said plane when the pin en is pivoted to engage said inner portion.

References Cited in the iile of this patent UNITED STATES PATENTS 926,899 Roy July 6, 1909 2,480,016 Granberg Aug. 23, 1949 2,645,515 Thomas July 14,1953 

